Rare USSR soviet lens INDUSTAR-4 GOMZ Brass for Big Format 13*18cm (prod. 1939)

Description

For your collection. You buy what you see on photos - USSR lens INDUSTAR-4, material - Brass, produced on GOMZ in 1939 - 82 years!
Serial number
- 3516. Serial number of four digits, which means that this lens was produced in one of the very first batches. These lenses are then followed by five-digit and six-digit numbers.
Lenses are clean without scratcher, diaphragm works well and smooth. There is a little bit dust inside.
DESCRIPTION:
Industar-4 (I-4) F = 21cm f4.5 - a lens with a fixed focal length for a frame format of 13x18 cm, was used for both FK 13x18 cameras, as well as for aerial photography (AFA-IM, NAFA-19, AFA- 27).
The lens has good residual aberration correction.
The lens was also used in the UA-1 magnifier, designed for making photographic magnifications from aerial negatives up to 19x19 cm in size.
Format: Large format.
Type: Fixed focal length (fixed).
Focus: Manual focus.
System: Large format.
Optical design: four lenses in three groups.
Characteristics:
Focal length 210mm.
Maximum aperture f / 4.5.
Minimum aperture f / 32.
Weight (gr.) 409mm.
Length (mm) 52mm.
Additional Information:
The angle of the field of view is 56 °.
Linear image field - 222 mm.
Resolution (center / edge) - 22/14 lines / mm.
Light transmittance not less than 0.77.
You can save a lot on delivery if you order several items at once. See my other ads with lenses
PAYMENT:
PayPal
DELIVERY:
I deliver  by Standart International shiping with a tracking number.If you think you wait for your parcel too long, please contact your local post office first. 99.9% of "lost" items wait there while you don`t know about it.If you have any issues with your purchase please contact me before leaving feedback. I value my customers and all problems can be solved.
FOR INTERNATIONAL BUYERS:
Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility.